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Investments (Investment Income) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Investments [Line Items] |  |  |
Total investment income | $ 130,820 us-gaap_NetInvestmentIncome | $ 128,877 us-gaap_NetInvestmentIncome | $ 135,461 us-gaap_NetInvestmentIncome
Less: Investment expense | (5,097)us-gaap_InvestmentIncomeInvestmentExpense | (4,339)us-gaap_InvestmentIncomeInvestmentExpense | (3,565)us-gaap_InvestmentIncomeInvestmentExpense
Net investment income | 125,723 us-gaap_InterestAndDividendIncomeOperating | 124,538 us-gaap_InterestAndDividendIncomeOperating | 131,896 us-gaap_InterestAndDividendIncomeOperating
Fixed Maturity Securities [Member] |  |  |
Investments [Line Items] |  |  |
Total investment income | 104,946 us-gaap_NetInvestmentIncome / us-gaap_DebtSecurityAxis = us-gaap_FixedIncomeSecuritiesMember | 107,926 us-gaap_NetInvestmentIncome / us-gaap_DebtSecurityAxis = us-gaap_FixedIncomeSecuritiesMember | 117,557 us-gaap_NetInvestmentIncome / us-gaap_DebtSecurityAxis = us-gaap_FixedIncomeSecuritiesMember
Equity Securities [Member] |  |  |
Investments [Line Items] |  |  |
Total investment income | 17,313 us-gaap_NetInvestmentIncome / us-gaap_DebtSecurityAxis = us-gaap_EquitySecuritiesMember | 18,249 us-gaap_NetInvestmentIncome / us-gaap_DebtSecurityAxis = us-gaap_EquitySecuritiesMember | 15,831 us-gaap_NetInvestmentIncome / us-gaap_DebtSecurityAxis = us-gaap_EquitySecuritiesMember
Short-Term Investments [Member] |  |  |
Investments [Line Items] |  |  |
Total investment income | $ 8,561 us-gaap_NetInvestmentIncome / us-gaap_DebtSecurityAxis = us-gaap_ShortTermInvestmentsMember | $ 2,702 us-gaap_NetInvestmentIncome / us-gaap_DebtSecurityAxis = us-gaap_ShortTermInvestmentsMember | $ 2,073 us-gaap_NetInvestmentIncome / us-gaap_DebtSecurityAxis = us-gaap_ShortTermInvestmentsMember

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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1, 2 , 3, 4, 5 -Article 9 + Details
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- Definition Amount of expenses related to the generation of investment income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 7 + Details
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